I'm using an M4600 to type this post (bought refurbished about a year ago for $830). Observations/comments on ownership and this deal:

1080p screen upgrade definitely worth the price - it's a TN panel, but pretty good considering (saturates sRGB, contrast is decent, color shift/viewing angles are better than just about all the other TN panels I've seen, the "sweet spot" on this display is quite large). Edit - gets super bright if you need it, too - between the high max brightness and anti-glare the display is quite usable in bright environments.

You'll also want at least 4GB of RAM for Win 7, but save money and install it yourself for less - accessing the RAM slots in this laptop is pretty easy.

Another note - with a dual core cpu you can only use 2 slots for a max of 16GB (you need a quad core if you want to use all 4 slots for a max of 32GB).

Ports - lots of ports makes this a nice choice for those using it as a desktop replacement - just about everything you could want (displayport, ethernet, hdmi, e-sata/usb 2.0 combo, firewire, 2x usb 3.0 + 2x usb 2.0, sd reader, etc).

Top tier wifi module - the intel 6300 is nearly as good as it gets - great wifi performance

This thing is built like a tank (also - heavy like a tank, too).

Battery life is just okay - I average a bit over 4 hours productivity (internet browsing, vpn for work) at reasonable brightness settings. Expect close to 2 hours max for heavy gaming. Note - the M5950 graphics do not dynamically switch to integrated - as far as I know there is no way to use the integrated graphics option (ie, for the purpose of better battery life).

Noise/heat - in regular use it is reasonably quiet, ie audible but not distracting, bottom gets warm, top stays pretty cool. The fans definitely spin up while gaming, bottom gets warmer but not really a big deal because if you are gaming you are probably not using it in your lap anyways.